I had exactly the same question when ordering, the dealer didn't seem too sure. As has been said, 430 gives you electrically foldable exterior mirrors together with the dimming function. This is what I ordered. From memory 313 gives you folding mirrors, no dimming but you do get additional interior lights. Thing is, the SE pack also includes the additional lighting, so those ordering an SE get this anyway. If you're ordering an SE, therefore, order option 430.